When the frames are off, usually r1327 shows 2-3 frames ahead compared to 2.23.1 and the other versions. So playback seems ok. Both the first and the last frame always are matching.
Seems some I frames decoded by 2.23.1 are decoded as B frames by r1327 and those are places where the mismatch is starting until the next I frame, which could be decoded either as I frame (frames are matching again) or as B frame (the mismatch is continuing).
Also tested some files encoded with x264 and always everything seems ok with these files.
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